psi particle psilotum nudum • psithurism · · · Info · Definitions · Characters · · psi particle · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) a neutral meson with a large mass. Synonyms: J particle, psi particle. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074